TOP1_HELPJ
ID TOP1_HELPJ Reviewed; 736 AA.
AC Q9ZMV7;
DT 30-MAY-2000, integrated into UniProtKB/Swiss-Prot.
DT 01-MAY-1999, sequence version 1.
DT 03-AUG-2022, entry version 139.
DE RecName: Full=DNA topoisomerase 1 {ECO:0000255|HAMAP-Rule:MF_00952};
DE EC=5.6.2.1 {ECO:0000255|HAMAP-Rule:MF_00952};
DE AltName: Full=DNA topoisomerase I {ECO:0000255|HAMAP-Rule:MF_00952};
DE AltName: Full=Omega-protein;
DE AltName: Full=Relaxing enzyme;
DE AltName: Full=Swivelase;
DE AltName: Full=Untwisting enzyme;
GN Name=topA {ECO:0000255|HAMAP-Rule:MF_00952}; OrderedLocusNames=jhp_0108;
OS Helicobacter pylori (strain J99 / ATCC 700824) (Campylobacter pylori J99).
OC Bacteria; Proteobacteria; Epsilonproteobacteria; Campylobacterales;
OC Helicobacteraceae; Helicobacter.
OX NCBI_TaxID=85963;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=J99 / ATCC 700824;
RX PubMed=9923682; DOI=10.1038/16495;
RA Alm R.A., Ling L.-S.L., Moir D.T., King B.L., Brown E.D., Doig P.C.,
RA Smith D.R., Noonan B., Guild B.C., deJonge B.L., Carmel G., Tummino P.J.,
RA Caruso A., Uria-Nickelsen M., Mills D.M., Ives C., Gibson R., Merberg D.,
RA Mills S.D., Jiang Q., Taylor D.E., Vovis G.F., Trust T.J.;
RT "Genomic sequence comparison of two unrelated isolates of the human gastric
RT pathogen Helicobacter pylori.";
RL Nature 397:176-180(1999).
CC -!- FUNCTION: Releases the supercoiling and torsional tension of DNA, which
CC is introduced during the DNA replication and transcription, by
CC transiently cleaving and rejoining one strand of the DNA duplex.
CC Introduces a single-strand break via transesterification at a target
CC site in duplex DNA. The scissile phosphodiester is attacked by the
CC catalytic tyrosine of the enzyme, resulting in the formation of a DNA-
CC (5'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 3'-OH
CC DNA strand. The free DNA strand then undergoes passage around the
CC unbroken strand, thus removing DNA supercoils. Finally, in the
CC religation step, the DNA 3'-OH attacks the covalent intermediate to
CC expel the active-site tyrosine and restore the DNA phosphodiester
CC backbone. {ECO:0000255|HAMAP-Rule:MF_00952}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=ATP-independent breakage of single-stranded DNA, followed by
CC passage and rejoining.; EC=5.6.2.1; Evidence={ECO:0000255|HAMAP-
CC Rule:MF_00952};
CC -!- COFACTOR:
CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_00952};
CC Note=Binds two Mg(2+) per subunit. {ECO:0000255|HAMAP-Rule:MF_00952};
CC -!- SUBUNIT: Monomer. {ECO:0000255|HAMAP-Rule:MF_00952}.
CC -!- SIMILARITY: Belongs to the type IA topoisomerase family.
CC {ECO:0000255|HAMAP-Rule:MF_00952}.
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DR EMBL; AE001439; AAD05695.1; -; Genomic_DNA.
DR PIR; B71972; B71972.
DR RefSeq; WP_000681518.1; NC_000921.1.
DR AlphaFoldDB; Q9ZMV7; -.
DR SMR; Q9ZMV7; -.
DR STRING; 85963.jhp_0108; -.
DR EnsemblBacteria; AAD05695; AAD05695; jhp_0108.
DR KEGG; hpj:jhp_0108; -.
DR eggNOG; COG0550; Bacteria.
DR eggNOG; COG0551; Bacteria.
DR OMA; PECKYTR; -.
DR Proteomes; UP000000804; Chromosome.
DR GO; GO:0005694; C:chromosome; IEA:InterPro.
DR GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR GO; GO:0003917; F:DNA topoisomerase type I (single strand cut, ATP-independent) activity; IEA:UniProtKB-UniRule.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0006265; P:DNA topological change; IEA:UniProtKB-UniRule.
DR CDD; cd00186; TOP1Ac; 1.
DR CDD; cd03363; TOPRIM_TopoIA_TopoI; 1.
DR Gene3D; 1.10.290.10; -; 1.
DR Gene3D; 1.10.460.10; -; 1.
DR Gene3D; 2.70.20.10; -; 1.
DR HAMAP; MF_00952; Topoisom_1_prok; 1.
DR InterPro; IPR000380; Topo_IA.
DR InterPro; IPR003601; Topo_IA_2.
DR InterPro; IPR023406; Topo_IA_AS.
DR InterPro; IPR013497; Topo_IA_cen.
DR InterPro; IPR013824; Topo_IA_cen_sub1.
DR InterPro; IPR013825; Topo_IA_cen_sub2.
DR InterPro; IPR013826; Topo_IA_cen_sub3.
DR InterPro; IPR023405; Topo_IA_core_domain.
DR InterPro; IPR003602; Topo_IA_DNA-bd_dom.
DR InterPro; IPR013498; Topo_IA_Znf.
DR InterPro; IPR005733; TopoI_bac-type.
DR InterPro; IPR028612; Topoisom_1_IA.
DR InterPro; IPR006171; TOPRIM_domain.
DR InterPro; IPR034149; TOPRIM_TopoI.
DR PANTHER; PTHR42785; PTHR42785; 3.
DR Pfam; PF01131; Topoisom_bac; 1.
DR Pfam; PF01751; Toprim; 1.
DR Pfam; PF01396; zf-C4_Topoisom; 3.
DR PRINTS; PR00417; PRTPISMRASEI.
DR SMART; SM00437; TOP1Ac; 1.
DR SMART; SM00436; TOP1Bc; 1.
DR SMART; SM00493; TOPRIM; 1.
DR SUPFAM; SSF56712; SSF56712; 1.
DR TIGRFAMs; TIGR01051; topA_bact; 1.
DR PROSITE; PS00396; TOPOISOMERASE_I_PROK; 1.
DR PROSITE; PS50880; TOPRIM; 1.
PE 3: Inferred from homology;
KW DNA-binding; Isomerase; Magnesium; Metal-binding; Repeat; Topoisomerase;
KW Zinc; Zinc-finger.
FT CHAIN 1..736
FT /note="DNA topoisomerase 1"
FT /id="PRO_0000145151"
FT DOMAIN 2..113
FT /note="Toprim"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT ZN_FING 572..598
FT /note="C4-type 1"
FT ZN_FING 616..642
FT /note="C4-type 2"
FT ZN_FING 663..689
FT /note="C4-type 3"
FT ZN_FING 702..725
FT /note="C4-type 4"
FT REGION 163..168
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT ACT_SITE 297
FT /note="O-(5'-phospho-DNA)-tyrosine intermediate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT BINDING 8
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT BINDING 82
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT BINDING 82
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT BINDING 84
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 32
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 139
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 140
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 143
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 299
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 484
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
SQ SEQUENCE 736 AA; 83263 MW; 779EF5655F3C14CF CRC64;
MKHLIIVESP AKAKTIKNFL DKNYEVVASK GHVRDLSKFA LGIKIDETGF TPNYVVDKDH
KELVKQIIEL SKKASITYIA TDEDREGEAI GYHVACLIGG KLESYPRIVF HEITQNAILN
VLKTPRKIDM FKVNAQQARR LLDRIVGFKL SSLIASKITK GLSAGRVQSA ALKLVIDREK
EIRPFKPLTY FTLDALFEPH LEAQLISYKG NKLKAQELID EKKAQEIKNE LEKESYIISS
IIKKSKKSPT PPPFMTSTLQ QSASSLLGFS PTKTMSIAQK LYEGVATPQG VMGVITYMRT
DSLNIAKEAL EEARAKILKD YGKDYLPPKA KVYSSKNKNA QEAHEAIRPT SIILEPNALK
DYLKPEELKL YTLIYKRFLA SQMQDALFES QSVVVACEKG EFKASGRKLL FDGHYKILGN
DDKDKLLPNL KENDPIKLEK LESNAHVTEP PARYSEASLI KVLESLGIGR PSTYAPTISL
LQNRDYIKVE KKQISALESA FKVIEILEKH FEEIVDSKFS ASLEEELDNI AQNKADYQQV
LKDFYYPFMD KIEAGKKNII SQKVHEKTGQ SCPKCGGELV KKNSRYGEFI ACNNYPKCKY
IKQTENANDE AKQELCEKCG GEMVQKFSRN GAFLACNNYP ECKNTKSLKN TPNAKETIEG
VKCPECGGDI ALKRSKKGSF YGCNNYPKCN FLSNHKPINK RCEKCHYLMS ERIYRKKKAH
ECIQCKERVF LEEDNG
